Campbell has been serving the heating, ventilation, air conditioning, building automation, plumbing, and refrigeration industries. The company serves northwest Ohio and southeast Michigan areas, and has grown to become one of the largest mechanical services contractors in the region. Campbell is independently owned and operated, and utilizes a computerized dispatch system. It is a commercial and industrial retrofit contractor, and one of the leading building automation systems contractors in the region. The company is a mechanical systems specialist, serving the commercial, industrial and institutional markets. It is a LINC service contractor providing preventive maintenance programs, service and repair for heating, ventilation and air conditioning and other mechanical systems in major industrial and commercial applications. Campbell is located in Northwood, Ohio.